i can't see the attachment; keep getting asked to log in even though i am. anyway, i find Mail, once it fails to get mail for some reason remembers that, and does need restarting; just quiting the app and reopening usually does it, but i guess you must have tried that? is there any error symbol next to the inbox(es)? another thing that often works once it's remembered it can't get mail is to get mail specifically for that mailbox by choosing:
Mailbox > Get new mail > the email address/account in question
rather than just clicking the get mail button but seeing as you've recreated the account i doubt any of that'll make any difference.